Effect of Coiling Temperature on Microstructure and Mechanical Properties of (B+M/A) X80 Pipeline Steel with Excellent Deformability

doi:10.11901/1005.3093.2014.291

Chinese Journal of Materials Research

2015, Vol. 29

Issue (3): 185-194 DOI: 10.11901/1005.3093.2014.291

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Effect of Coiling Temperature on Microstructure and Mechanical Properties of (B+M/A) X80 Pipeline Steel with Excellent Deformability

Jing MA(

),Xiaoyong ZHANG,Shixia CHENG,Huilin GAO

School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

Cite this article:

Jing MA,Xiaoyong ZHANG,Shixia CHENG,Huilin GAO. Effect of Coiling Temperature on Microstructure and Mechanical Properties of (B+M/A) X80 Pipeline Steel with Excellent Deformability. Chinese Journal of Materials Research, 2015, 29(3): 185-194.

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Abstract

High deformability X80 pipeline steel with microstructure composed of bainite and martinsite/austenite (B+M/A) can be obtained through the coiling continuous partitioning process. Effect of coiling temperature on the microstructure evolution and mechanical performance of the (B+M/A) X80 pipeline steel was studied by means of microscopic analysis, X-ray diffraction and mechanical property tests. The results show that with the increasing coiling temperature, the strength of the steel decreases and the ductility increases because of the decrease amount of bainite and dislocation density, as well as the increase amount of retained austenite. By a high coiling temperature, both of the precipitation of carbides and the decomposition of retained austenites result in the increase of strength and the decrease of plasticity. With a process by proper coiling temperature, the produced steel with such (B+M/A) dual-phase structure may exhibit a comprehensive mechanical performance with such as lower ratio of yield to strength, higher uniform elongation and strain hardening index, which meets the technical requirements of high deformability pipeline steel.

Key words: metallic materials (B+M/A) X80 pipeline steel with excellent deformability the coiling continuous partitioning process coiling temperature microstructure and properties

Received: 17 June 2014

Fund: *Supported by National Natural Science Foundation of China No.51174165, Special Project on Important Discipline of Shaanxi Province No. YS37020203, and Natural Science Fund of Shaanxi Province No. 2014JM6232.

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	Jing MA
	Xiaoyong ZHANG
	Shixia CHENG
	Huilin GAO

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.291 OR https://www.cjmr.org/EN/Y2015/V29/I3/185

Fig.1 Schematic of the simulation coiling continuous process

Table 1 Chemical composition of X80 experimental steel (mass fraction, %)

Fig.2 Stress-strain curves of the X80 experimental steel at different coiling temperatures

Fig.3 Tensile properties of the X80 experimental steel at different coiling temperatures, (a) strength, (b) ductility

Table 2 The yield ratio (R_t0.5/R_m), uniform elongation (UA) and strain hardening index (n) of the X80 steel at different coiling temperatures

Fig.4 Impact toughness of the X80 experimental steel at different coiling temperatures

Fig.5 SEM images of X80 experimental steel at different coiling temperature, (a) 380℃, (b) 410℃, (c) 440℃, (d) 470℃, (e) 500℃

Fig.6 TEM images of carbide precipitation at higher coiling temperature, (a) 470℃, (b) 500℃

Table 3 The bainite content of the experimental steel at different coiling temperature (%)

Fig.7 TEM images of bainite at typical coiling temperatures, (a) 380℃, (b) 410℃, (c) 440℃, (d) 500℃

Fig.8 Enlarged TEM images of bainite at typical coiling temperature, (a) 380℃, (b) 500℃

Fig.9 TEM image of carbides precipitation at coiling temperature of 470℃

Fig.10 TEM images of M/A at typical coiling temperature, (a) 380℃, (b) 440℃, (c) 500℃

Fig.11 Bright-field and dark-field images (a, b) and electron diffraction pattern (c) of M/A constituent at coiling temperature of 440℃

Fig.12 M/A content of X80 steel at different coiling temperatures

Fig.13 Bright-field and dark-field images (a, b) and electron diffraction pattern (c) of residual austenite at coiling temperature of 380℃

Fig.14 Bright-field and dark-field images (a, b) and electron diffraction pattern (c) of residual austenite at coiling temperature of 440℃

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